That tune is basically all major triads. Try it with just the guitar alone. Even the 1/5 bass line can confuse things. If you leave too many instruments in there, then the CW is trying to figure out a major triad with a b5 or a #9 or whatever in the melody with a 5 in the bass. Problem is even the chording instruments like a guitar may be following the melody in certain places. As you know a chord chart may only have major triads on it but including the melody or the myrid passing notes that are in even a simple song like that can add all kinds of weird chords if you were to actually take all the notes into account.
Something else to try is find a Biab file, not a midi file of that tune. Someone has probably entered the correct chords in a Biab file.

Bob


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